Hoisting-block.



S. LOWENSTEIN.

HOISTING BLOCK.

APPLICATION FILED APR.14, 1914.

3 SHEETSSHEET 1.

7/ g a B d fl /"-I I.

7 V WITNESSES M 5W0? '5 60mm? nsz zn ATTORNEYS n! r mums I'Flldg: c0PIIOIUJJ'IIIII WASHINGTON, D. c.

S. LOWENSTBIN.

HOISTING BLOCK.

APPLICATION FILED APR.14,1914.

1,104,52 1 Patented July 21,1914.

3 HEETSSHEET 2. 7y z j Fig.3.

WITNESSES INVENTOR Jamarzlawe %7 Q\ By ATTORNEYS THE NORRIS PETERS 60..PHOTO'LITHOH WASHINGTON. 01C

S. LOWENSTEIN.

HQISTING BLOCK.

APPLICATION FILED APR.14, 1914.

'1,1@4,521, A Patented July 21, 1914.

3 SHEETSSHEBT 3.

BY 1 I I I I ATTORNEYS HH: AmeRls PETERS 60.. PHOTO-LiTH()., WASHINGTON,D. 1:.

SAMSON LOWENSTEIN, OF NEW YORK, N. Y.

HOISTINGr-IBLOCK.

Specification of Letters Patent.

Patented July 21, 1914.

Application filed April 14., 1914. Serial No. 831,747.

To all whom. it may concern Be it known that I, SAMSON LowENsrnIN,

a subject of the Czar of Russia, and a resldent of the city of New York,borough of Manhattan, in the county and State of New York, have inventeda new and Improved Hoisting-Block, of which the following is a full,clear, and exact description.

This invention relates to hoisting blocks, and more particularly toautomatic clutches whereby the load sustained by the block or tackle maybe locked or held in any desired position, and whereby dropping of theload is prevented while the operator is performing the act of hoistingthe load.

The invention has for its general objects to improve and simplify theconstruction and operation of hoisting blocks and clutching mechanismtherefor so as to be reliable and efficient in use, comparativelyinexpensive to manufacture and readily manipulated.

Another object of the invention is the provision of a novel form ofclutching dog which an be manually thrown out of clutching position withrespect to the rope that passes through the block and which is equippedwith a prop or other supporting means for holding the dog in thrown-outposition, so as to enable the load sustained by the block to be lowered,such prop being so related to the pulley that it will be automaticallyreleased to allow the dog to drop to clutching position as soon as thehoisting of the load begins. I

With such objects in view, and others which will appear asthe'description proceeds, the invention comprises various novel featuresof construction and arrangement of parts which will be set forth withparticularity in the following description and claims appended hereto.

In the accompanying drawing, which illustrates one embodiment of theinvention, and wherein similar characters of reference indicatecorresponding parts in all the views, Figure 1 is a perspective view ofthe improved block shown applied to a painters scaffold; Fig. 2 is anenlarged sectional view of the block taken parallel with the plane ofthe pulley; Fig. 8 isa central vertical section of the block; Fig. A isan edge view of the block; Fig. 5 is a horizontal section on the line55, Fig. 2; Fig. 6 is a perspective view of a hoisting tackle showingthe invention applied to the upper multiple pulley block; and Figs. 7and 8 are sections on lines 7'?' and 88, Fig. 6.

Referring to the drawing, A designates the block which is shownas of thesingle sheave type; B is the hoisting rope; C the scafi'old supportingyoke suspended from the block and supporting the scaffold D. Obviouslythe block A may be used for hoisting and suspending any other kind ofload.

The block A comprises a housing or body that includes a U-shaped frameor yoke l and side plates 2 suitably fastened to the said yoke. Thelower end of the yoke constitutes a loop or eye to which is fastened asuspending hook or equivalent device 2 The upper extremities of the sidemembers 3 of the yoke are connected together by a bolt or equivalentmeans A which has an eye 5 around which the extremity 6 of the hoistingrope B is fastened. In the lower end of the housing or body of the blockis a sheave or pulley 7 which rotates on an axle 8 formed by a bolt orequivalent means passing through the yoke 1 and side plates 2. The firstrun or flight b of the hoisting rope extends from the top of the blockupwardly to an overhead pulley; the second run or flight 6 extendsdownwardly into the block and passes under the pulley 7; the thirdflight or run 6 extends upwardly to another overhead pulley, and thefourth or free run or flight 6 extends down to any suitable point whereit can be operated.

The clutching means comprises a dog E which is fastened at its center toa crank shaft or axle 8, which axle extends out of the body or housingof the block and is provided with a throw-out crank 9. Both extremitiesare formed into eccentric serrated gripping faces 10 which are adaptedrespectively to engage the flights Z) and b of the hoistingrope andclutch the same against abutments 11 andlQ for the flights b and 6respectively. Normally the double-ended dog is in the dotted lineposition, Fig. 2, during the act of hoisting, so as to be ready to gripthe'hoisting rope if the hoisting power should be accidentally released,and in this event the dog will clutch the rope against the abutments 11and 12. The travel of the rope, however, during the act of hoistingmaintains the dog released. The dog is adapted to be supported ininoperative position by means of a prop 13' which is pivoted at 14 toone end of the dog so that the weight of the prop will operate tomaintain have come to'rest to one side of a line pass i ing throughthecenter of the pulley 7 and axis of the dog E; The prop is adapted tobe thrown out of supporting position auto matically by means of teeth 17on the periphery of the pulley 7. "When the dog is propped ininoperative position, as shown in Fig. 2, the load sustained by theblock can be lowered without the dog interfering, but if it is desiredto lift the load a pull will be exerted on the hoisting rope to move thesame in the direction indicated by the fullline arrows, and consequentlythe pulley 7 will move in a clockwise direction, Fig. 2, and therebytrip the prop 13 and allow the dog to gravitate to dotted-line position,where it will be ready to grip the rope if the hoisting pull should beaccidentally released. A yielding cam 18 is provided on the prop so asto engage a fixed stop or abutment 19 arranged in the body ,of the blockjust below the dog axle 8. This cam will except either extreme position.On the dog E is a buffer spring or equivalent means 20 arranged tostrike an abutment 21 to limit the throw-out movement of the dog whenthe crank 9 is operated. It will be understood that when the prop is inthe full-line position shown in Fig. 2, the pulley 7 can freely pass inan anti-clockwise direction without the prop interfering, as the latterwill ride up and down as the teeth of the pulley pass under the prop.

ley type,,as the block D Figs- 6, 7 and 8, the double clutch dog E hasits end-gripping'portions 10 wideenough to grip all the runs or flightsof the rope passing over the pulleys 7 and 7*. Thus, when the rope Bbreaks-or the power or pull end slips or is released, the runs 6 and bare clamped against the abutment 11 and runs 6 and b clamped againstthe, abutment 12 The crank 9 of the dog E isprovided with a pull rope 0so as to throw the dog E to released or inoperative position, and theprop or member 13 engages the teeth l7 on the pulley 7 to hold thedog Ereleased. The automatic setting of the dog E takes place wh'en'the pullrun I) is slackened, just as in the case with the arrangement shown inFigs. 2 and 3.

From the foregoing description taken in connection with the accompanyingdrawing, the advantages of the construction and method of operationwillbe readily under claim as new and desire to secure by Letters Patent: II v 1. A tackle block comprising a body, a

,pulley therein, a rope passing around the pulley, a clutch devicehaving a plurality of gripping portions for automatically gripping therope when thelatter moves in one Z direction, ithrowing the device outof clutching relation to the rope, and a device for maintainjing theclutching device in unclutching po- Z sition.

manually actuated means for 2; A tackle block comprising a body, apulley mounted therein, a rope passing around the pulley, a double endclutch dog L arranged to grip the rope at a plurality of points when therope moves in one direction,

1 and a prop device disposed between the pul ley and dog for holding thelatter in inoperative position and adapted to be tripped by pr Vent theprop 13 fmm Occupying my fmovement of the pulley in one direction.

e i y L 3. A tackle block comprising a body, a

pulley, an abutment along which the rope travels, a dog for gripping therope against j the abutment, means connected with the dog 5 for throwingthe same to inoperative position, and a prop connected with'and carriedby the dog and arranged to engage the pulj ley to support the dog ininoperative posif tion,and adapted to be automatically tripped i as thepulley moves during the hoisting of a a load.

In the case of blocksof the multiple pul- Y 4. A. tackle blockcomprising a body, a

passes, a double-ended dog arranged to grip the rope against theabutments, a prop pivotally connected to the dog near one end to serveas a weight for causing the dog to antomatically engage the rope, andmanually actuated means connected with the dog for throwing the same tovinoperative position and support the prop of the pulley, whereby theprop maintains the inoperative position of the dog. V

5. A tackle block comprising a body, a

mlle therein a re 3e assin around the pulley, abutments along which therope passes, a double ended dog arranged to grip the rope against theabutments, a prop pivotally connected to the dog near one end to serveas a weight for causing the dog to au-- 1; tomatically engage the rope,manually actuated means connected wlth the dog for throwing the same toinoperative position and support the prop of the pulley, whereby theprop maintains the. inoperative position of the dog, and teeth on thepulley with which the prop engages for tripping the prop when the pulleymoves in one direction.

6. A tackle block comprising a body, a pulley therein, a rope passingaround the pulley, abutments along which the rope passes, a double-endeddog arranged to grip the rope against the abutments, a prop pivotallyconnected to the dog near one end to serve as a weight for causing thedog to automatically engage the rope, manually actuated means connectedwith the dog for throwing the same to inoperative position and supportthe prop of the pulley, whereby the prop maintains the inoperativeposition of the dog, teeth on the pulley with which the prop engages fortripping the prop when the pulley moves in one direction, a yielding cam011 the prop, and a stop with which the cam engages for holding the propin either of its extreme positions.

7. In a block, the combination of a U- shaped frame or yoke, said platesfitted to the yoke, a horizontally extending looped element passingthrough the yoke and hav ing its ends arranged to form abutments, apulley mounted between the plates, a rope passing around the pulley andcrossing the said abutments, a dog mounted within the yoke and betweenthe said abutments for gripping the rope against the latter, an axle forsupporting the dog, a crank connected with the axle for throwing the dogto released position, and means for holding the dog in such releasedposition.

8. A block including a frame, a plurality of pulleys, a rope having runspassing over the pulleys, abutments on the frame and along which theruns travel, and a single clutch element having its ends adapted to gripsimultaneously a plurality of runs of the rope against the saidabutments in case of breakage or slipping of the rope.

9. A tackle block comprising a body, a pulley therein, a rope passingaround the pulley, a swinging clutch mounted in the body and arranged togrip the rope to prevent movement thereof in one direction and permitmovement in the opposite direction, means for moving the clutch deviceto inoperative position out of engagement with the rope, and a prophaving one end pivotally connected with the clutch device, and the otherend free to ride on the pulley and assume a position for propping theclutch device in inoperative position after it has been manually removedfrom rope-engaging position.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

SAMSON LOlVENSTEIN.

Witnesses: ADoLrrr SIIAPIRO, JULIUs BROWNER.

Copies of thin patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

